Java - boton

import javax.swing.*;

import java.awt.event.*;

public class PruebaFrames extends JFrame {

	public static JButton boton = new JButton("Botón");

	private PruebaFrames() {

		setTitle("PruebaFrames");

		setBounds(100, 100, 200, 200);

		getContentPane().add(boton);

		setDefaultCloseOperation(EXIT_ON_CLOSE);

		boton.addActionListener(new ActionListener(){

			public void actionPerformed(ActionEvent evetn) {

				Frame2 f2 = new Frame2();

				f2.setVisible(true);

			}

		});

	}

	public static void main(String args[]) {

		PruebaFrames pf = new PruebaFrames();

		pf.setVisible(true);

	}

}

class Frame2 extends JFrame {

	public Frame2 () {

		setTitle("SegundoFrame");

		setBounds(200, 200, 100, 100);

		PruebaFrames.boton.setEnabled(false);

		addWindowListener(new WindowAdapter() {

			public void windowClosing(WindowEvent e) {

				PruebaFrames.boton.setEnabled(true);

			}

		});

	}

}